To build a real audience I would shy away from adwords and giveaways. Focus on publishing good content often instead that will get people signed up who are trul

To build a real audience I would shy away from adwords and giveaways. Focus on publishing good content often instead that will get people signed up who are truly interested. Depending on the audience, spend time answering questions in discussion groups, engage with your existing audience through emails and her website. Instead of a giveaway provide value to signups through an ebook or a drip set of emails with small helpful pdfs that provide them value and will keep them interested and coming back. Look in to doing guest posts/interviews and/or sponsoring popular blogs and podcasts in her niche. Good luck building the list it can be a long road.